Answer:
Oiling is done on a regular basis to sewing Machine because in the machine there are lots of machinery parts i.e. wheels and axels, etc. which are in continuous use and they possess so much frictional force between them that wear tear may be observed in those parts.
For Frictionless sewing
4 Describe What effect does observing a
substance's physical properties have on the
substance?
Answer:
From observing a substance's physical properties it has no effect on the substance because you are just observing it and not changing it.
please help I need to ace this test
When two atoms attach to each other by sharing electrons it is called a...
A: Covalent bond
B: Ionic bond
C: none of these - atoms can't bond to each other.
D: Nuclear bond
2nd question
Two hydrogen atoms bonded together form a compound
A: True
B: False
3rd question
Water is two hydrogen atoms bonded to an oxygen atom. This is an example of a compound
A: True
B: False
like I said I need help on this and I don't wanna fail
#1: A covalent bond
#2 False
#3True
The metal element cesium has one electron in its outer orbit. Will cesium atoms form positively charged or negatively charged ions? Predict their charge.
Answer:
Caesium atoms will form positively charged ions.
Explanation:
Due to them having one electron in their outer orbit, it is very likely that they will give that electron away to form an octet and become stable. Hence, since they lose an electron, they lose a negative charge, and in comparison to their former non-ion self, they have gained a positive charge.
Hence, they will form positively charged ions.
Hope this helped!
why carbon is a basic thing to classify as organic and inorganic compounds?
Answer:
To answer, all living organisms contain carbon-based compounds, which classifies them organic.
Simply, carbon dioxide, is an example of an inorganic compound since it does not contain both carbon and hydrogen. Alternatively, one molecule of carbon dioxide contains one atom of carbon and two atoms of oxygen.
Limestone formations in caves is considered what kind of weathering?
hydraulic
mechanical
biological
chemical
Answer:
chemical
Explanation:
Balance the equation Mg+CO2 - - - - - -) MgO+c
Answer:
2Mg (s) + CO₂ (g) → 2MgO (s) + C (s)
General Formulas and Concepts:
Chemistry - Reactions
Reaction PredictionBalancing RxN'sExplanation:
Step 1: Define RxN
Mg (s) + CO₂ (g) → MgO (s) + C (s)
Step 2: Balance RxN
2Mg (s) + CO₂ (g) → 2MgO (s) + C (s)
We need to balance the number of O's on both sidesIf we balance the O's, we will also need to balance the Mg'sthe number of molecules in 7g nitrogen
Answer:
the number of molecules in 7g nitrogen
Ans) 7 gram of Nitrogen contains 1.5×10^23 molecules =1.5e+23
Which method of heat transfer is the person in the picture below most worried about?
Radiation
Conduction
Convection
Answer:
Radiation ...........
[tex]\huge\boxed{Conduction}[/tex]
_____________________________________Conduction:Conduction is the transfer of heat when two things come in contact with each other. The energy transfer is from hotter body to the colder body.
x---------------------------------------------x
Fire Walking:There is a trick behind fire-walking. When the coal burns, after sometime there is a layer of ash on the surface of the coal which blocks the radiation. So the transfer of heat is not possible from radiation. Conduction is the only way possible. The person's feet and coal both are poor conductor of heat so if we walk quickly i.e. there is minimal time of contact with the coal, it will just feel a little warm. As the person start walking on the coal, It has to do it quickly, that way Person will feel its sole warming up but it is not that hot because of the layer of ash and poor conductance, after few steps the ash also sticks on to the sole of the person which makes kind of double layers of ash. So the only way for heat transfer is CONDUCTION.
_____________________________________Best Regards,'Borz'8. Consider the element Scandium, atomic # 21.
(a) If the electronic configuration of the element were constructed "from scratch", into which
orbital (and into which shell) would the final electron be placed? (1)
(b) When scandium forms an ion with a charge of +1, from which orbital (and from which
shell) would the electron be removed? (1)
Explanation:
Scandium has atomic number of 21. This means that in it's neutral state its going to have 21 electrons.
a) The full electronic configuration is given as;
1s2 2s2 2p6 3s2 3p6 3d1 4s2
The final electron is placed in the d orbital. The shell is 3d
(b) When scandium has a charge if +1, it has lost an electron. The total number of electrons would now be 21-1 = 20
The electronic configuration would be given as;
1s2 2s2 2p6 3s2 3p6 4s2
The electron in the 3d orbital would be removed.
What is radioisotope?
Answer:
An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable. Radioisotopes may occur in nature or be made in a laboratory. In medicine, they are used in imaging tests and in treatment.
Hope I could help!
Answer:
(RAY-dee-oh-I-suh-tope) An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable. Radioisotopes may occur in nature or be made in a laboratory. In medicine, they are used in imaging tests and in treatment. Also called radionuclide.
Explanation:
1. What was the first recorded element to be discovered?
Answer:
Phosphorous
Explanation:
Although elements such as gold, silver, tin, copper, lead and mercury have been known since antiquity, the first scientific discovery of an element occurred in 1649 when Hennig Brand discovered phosphorous.
What is the relationship between the number of energy levels that an electron falls and the energy of the photon that is emitted when it falls?
Answer:
Hope this helps! :)
Explanation:
Light is absorbed when an electron jumps to a higher energy orbit and emitted when an electron falls into a lower energy orbit. The energy of the light emitted or absorbed is exactly equal to the difference between the energies of the orbits.
The energy of the electron drops when it changes levels, and the atom releases photons. The emission of the photon occurs as the electron transitions from a higher to a lower energy state.
What is a photon ?The electromagnetic force is carried by a photon, a basic particle that is a quantum of the electromagnetic field and includes electromagnetic radiation like light and radio waves. Since photons have no mass, they constantly travel in a vacuum at the speed of light.
When a photon of the appropriate wavelength collides with an atom, it vanishes and transfers all of its energy to the electron, which causes it to jump to a higher energy level.
The energy differential between two energy levels determines the amount of energy that is released during a certain transition.
Thus, The energy of the photon is precisely the energy that is lost when an electron moves to a level with less energy.
To learn more about photon, follow the link;
https://brainly.com/question/28134171
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How does the convection current drive, make the plates move?
Answer:
Geologists have hypothesized that the movement of tectonic plates is related to convection currents in the earth's mantle. ... Tremendous heat and pressure within the earth cause the hot magma to flow in convection currents. These currents cause the movement of the tectonic plates that make up the earth's crust.
Explanation:
Answer:
Geologists have hypothesized that the movement of tectonic plates is related to convection currents in the earth's mantle. ... Tremendous heat and pressure within the earth cause the hot magma to flow in convection currents. These currents cause the movement of the tectonic plates that make up the earth's crust.
Explanation:
What type of radioactive decay is shown? 82 Br → 82 Kr + te 35 36 Alpha O Beta O Gamma?
Answer:
In 1889, Ernest Rutherford recognized and named two modes of radioactive decay, showing the occurrence of both processes in a decaying sample of natural uranium and its daughters. Rutherford named these types of radiation based on their penetrating power: heavier alpha and lighter beta radiation. Gamma rays, a third type of radiation, were discovered by P. Villard in 1900 but weren't recognized as electromagnetic radiation until 1914. Since gamma radiation is only the discharge of a high-energy photon from an over-excited nucleus, it does not change the identity of the atom from which it originates and therefore will not be discussed in depth here.
Because nuclear reactions involve the breaking of very powerful intra nuclear bonds, massive amounts of energy can be released. At such high energy levels, the matter can be converted directly to energy according to Einstein's famous Mass-Energy relationship E = mc2. The sum of mass and energy are conserved in nuclear decay. The free energy of any spontaneous reaction must be negative according to thermodynamics (ΔG < 0), and ΔG is essentially equal to the energy change ΔE of nuclear reactions because ΔE is so massive.
Explanation:
Hope it helps
Which element has a greater ionization energy, rubidium or iodine?
Answer: Iodine I think.
Explanation:
With your class, look up the element names for each symbol in the word "BOOK" and list the element names.
Explanation:
The word BOOK; is made up of 4 letters and each actually represents the symbol of an element.
An element is a distinct substance that cannot be split-up into simpler substances.
B - Boron
O - Oxygen
O - Oxygen
K - Potassium
We can see that the word BOOK shows us elements boron, oxygen, oxygen and potassium.
How many liters of ammonia are formed with 49.8 g of nitrogen gas reacting with 10.7 g of hydrogen gas at S.T.P.?
PLEASE HELP I'LL MARK BRAINLIEST
Describe, on the molecular level, why my glasses get fogged up when I wear my face mask (so dang annoying). Be sure to use these terms: -decreased kinetic energy -surface -attraction
Answer:
When you are in a cool place and exhale into your mask, the mask blocks and re-directs some of your breath up toward the top edge of the mask and under your glasses. ... When the warm breath hits the cool lens, the water in the breath condenses causing your lenses to fog up.
Which models of the atom does the experimental evidence from Bohr's hydrogen experiment support? Explain why these models are compatible with the experimental results.
The models are Daltons, Thompsons, and Rutherfords
Answer:
Rutherfords
Explanation:
The model of the atom supported by Bohr's hydrogen experiment is the Rutherford's model of the atom.
Rutherford through his experiment on gold foil suggested the atomic model of the atom. The model posits that an atom has a small positively charged center(nucleus) where nearly all the mass is concentrated.
Surrounding the nucleus is the large space containing electrons. In the Bohr's model of the atom, he suggested that the extranuclear space of the atom is made up of electrons in specific spherical orbits around the nucleus.is it an animal of plant cell?
Answer:
Structurally, plant and animal cells are very similar because they are both Eukaryotic cells. They both contain membrane-bound organelles such as the nucleus, mitochondria, endoplasmic reticulum, golgi apparatus, Iysosomes and peroxisomes. Plant cells can be larger than animal cells.
Explanation:
I majored in Chemistry
can anyone try my questions, please will give points
Answer:
um..... okay I'll give it a shot
what is the
difference between ice
and water vapour.
Answer:
Nothing. I guess ice vapor is a solid and water vapor is a liquid if nothing isn't an option, but that makes no sense.
Explanation:
Sodium will do an ionic bond with
Answer:
Chorine
Explanation:
It's a classic, sodium chloride, table salt, which is an ionic bond.
PLS GIVE BRAINLIEST
What determines whether something is a solid, a liquid or a gas?
Write the electron configuration for the electrons identified by the following quantum numbers:
a) 2, 1, 0, -½
b) 4, 2, 0, -½
c) 5, 3, 2, -½
Thanks!
Answer:
see the answer at the pic
The electron configuration for the electrons as listed are:
a) 1s² 2s² 2p⁵ = 9X
b) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d⁸ = 46 X
c) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴
Using the quantum numbers of the identified electrons to derive the electron configuration ( the representation of the distribution of electrons in the orbit of an atom ) electron configuration of electrons can be calculated using the formula :2n².
where n = orbit number and the various energy levels are represented as 1,2,3,4... while shells of the an atom is written as K,L,M,N
hence the electron configuration of the electrons identified by the quantum numbers are as written above.
Learn more : https://brainly.com/question/20974986
Use the information in the table to describe the temperature-vs.-time diagrams.
The diagram for gallium will have flat, horizontal lines
°C.
The diagram for methane will have a
line representing the
between -183°C and -162°C.
For gold, the boiling point corresponds to the y-value at
°C of the
For nitrogen, the line at -210°C will be
, which represents the
Answer:
At 30 and 2,204
diagonal
liquid phase
2856
top horizontal line
flat
the change from a solid to a liquid
Explanation:
Which feature is most likely found at a divergent boundary?
Answer:
Most divergent plate boundaries are underwater and form submarine mountain ranges called oceanic spreading ridges. While the process of forming these mountain ranges is volcanic, volcanoes and earthquakes along oceanic spreading ridges are not as violent as they are at convergent plate boundaries.
Explanation:
Answer:
C-Fault block mountain
Explanation:
Tension occurs at divergent boundaries. Tesnion is a type of stress that occurs when plates move apart. Rocks stretch apart creating fault block mountains
In order to follow the octet rule, how many valence electrons do most elements
want?
a. 2
b. 4
c. 6
d. 8
Answer: D (8)
Explanation:
Answer:
d. 8
Explanation:
The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds.
What does the chemical formula CaCl2 show about the compound it represents?
A.It is made up of one element.
B.It is made up of two elements.
C.It is made up of three elements.
D. It is made up of four elements.
Help asap please
Answer:
b
Explanation:
Which of the following values displays the pH of a base?
Question 19 options:
2
7
9
Answer:
9 is your answer
Explanation:
coz anything above 7.0 is Base on PH paper !
Hope you got it.